This is very common sense and I'm sure a lot of my fellow goblins are doing this already, but I figured I'd give the unenlightened a heads up. I did a search and couldn't find anything on this specific mechanic, so...
Easily enough, the tip is that with the Goblin racial Rocket Jump, you can avoid fall damage in the same way Blink works. Whenever you jump off a cliff/ledge (or get knocked; pesky shamans!!!), simply wait until you're within what would be a safe height to fall from, do Rocket Jump and you will reset your fall.
Eg, a shaman knocks you off a ledge that is 400 yards up and you're heading for death. When you're about 30 yards over ground, do Rocket Jump and you'll only receive damage equal to a fall from 30 yards up.
Saved me a few times already...
Have fun.